Regular Viz reader, I've stuck with it through thick and thin. The introduction of the 'defacement' competition has been a high-point in the past couple of years, although I wish they'd print the winning entries so they are large enough to see properly.
My very favourite item was a news piece they once ran on schools who had begun refusing to teach the eight-times-table. Very subtly done, didn't bring attention to itself, but was devastating in its attack on anti-Darwinists.
Another one-off strip that I admired (although if memory serves, it was a spin-off from 'Sid the Sexist') was 'Big Fuckin' Dave', all about a Geordie bruiser and his spindly hanger-on of a mate, out boozing every night - should anyone in the pub happen to use the word "half" in everyday conversation, Dave took great offence and glassed them...